Check the listing for details. Continuum Reagents Refractometer Calibration Standard – Seawater Reference for. Condition: New. Listed at 10.49 USD. Continuum Reagents Refractometer Calibration Standard – Seawater Reference for Product Description Continuum Reagents Refractometer Calibration Standard is designed to provide an accurate reference for the calibration of seawater refractometers, hydrometers and other density measuring equipment. Features Designed to provide an accurate reference for the calibration of seawater refractometers, hydrometers and other density measuring equipment 35 ppt Salinity 53 uS/cm at 25 deg c Age range description: All Life Stages Shipping Payment Returns Shipping for this item is free in the 48 continental United States. We do not offer shipping to Alaska, Hawaii, Puerto Rico, US Territories, APO & FPO. After your order has been shipped, you will receive an e-mail with the name of the carrier and the tracking number. We accept payments through PayPal. You may use a major credit card via PayPal. For all “Buy It Now” items, immediate payment is required. We permit returns if you are not satisfied with your purchase. Your return request must be initiated within 30 days of the purchase date. To initiate a return, please contact us through the eBay Message Center. You will receive an RMA number to ensure proper handling of the return. We do not provide refunds for a return WITHOUT an RMA number. You will be refunded in full, minus the shipping and handling expenses incurred at time of purchase.